Parity-time-symmetric two-qubit system: entanglement and sensing
- URL: http://arxiv.org/abs/2305.19034v1
- Date: Tue, 30 May 2023 13:51:49 GMT
- Title: Parity-time-symmetric two-qubit system: entanglement and sensing
- Authors: J. Zhang, Y. L. Zhou, Y. L. Zuo, P. X. Chen, H. Jing, L. M. Kuang
- Abstract summary: We study exceptional-point effects and quantum sensing in a parity-time (PT)-symmetric two-qubit system with the Ising-type interaction.
We show that entanglement can be generated more quickly than the corresponding Hermitian system.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: In this paper we study exceptional-point (EP) effects and quantum sensing in
a parity-time (PT)-symmetric two-qubit system with the Ising-type interaction.
We explore EP properties of the system by analyzing degeneracy of energy
eigenvalues or entanglement of eigenstates. We investigate entanglement
dynamics of the two qubits in detail. In particular, we demonstrate that the
system can create the steady-state entanglement in the PT-broken phase and
collapse-revival phenomenon of entanglement in the PT-symmetric phase during
the long-time evolution. We show that entanglement can be generated more
quickly than the corresponding Hermitian system. Finally, we prove that the
sensitivity of eigenstate quantum sensing for the parameters exhibits the
remarkable enharncement at EPs, and propose a quantum-coherence measurement to
witness the existence of EPs.
Related papers
- Topological transitions in quantum jump dynamics: Hidden exceptional points [45.58759752275849]
Phenomena associated with exceptional points (EPs) have been extensively studied in relation to superconducting circuits.
We consider a monitored three level system and find multiple EPs in the Lindbladian eigenvalues considered as functions of a counting field.
We identify dynamical observables affected by these transitions and demonstrate how the underlying topology can be recovered from experimentally measured quantum jump distributions.
arXiv Detail & Related papers (2024-08-09T18:00:02Z) - Crossing exceptional points in non-Hermitian quantum systems [41.94295877935867]
We reveal the behavior of two-photon quantum states in non-Hermitian systems across the exceptional point.
We demonstrate a switching in the quantum interference of photons directly at the exceptional point.
arXiv Detail & Related papers (2024-07-17T14:04:00Z) - Restoring Adiabatic State Transfer in Time-Modulated Non-Hermitian
Systems [0.0]
We show that adiabaticity can be achieved when dynamically winding around exceptional points (EPs) in non-Hermitian systems.
Our findings offer a promise for advancing various wave manipulation protocols in both quantum and classical domains.
arXiv Detail & Related papers (2024-02-23T12:53:16Z) - Enhanced Entanglement in the Measurement-Altered Quantum Ising Chain [46.99825956909532]
Local quantum measurements do not simply disentangle degrees of freedom, but may actually strengthen the entanglement in the system.
This paper explores how a finite density of local measurement modifies a given state's entanglement structure.
arXiv Detail & Related papers (2023-10-04T09:51:00Z) - Evolution of many-body systems under ancilla quantum measurements [58.720142291102135]
We study the concept of implementing quantum measurements by coupling a many-body lattice system to an ancillary degree of freedom.
We find evidence of a disentangling-entangling measurement-induced transition as was previously observed in more abstract models.
arXiv Detail & Related papers (2023-03-13T13:06:40Z) - Geometric phases along quantum trajectories [58.720142291102135]
We study the distribution function of geometric phases in monitored quantum systems.
For the single trajectory exhibiting no quantum jumps, a topological transition in the phase acquired after a cycle.
For the same parameters, the density matrix does not show any interference.
arXiv Detail & Related papers (2023-01-10T22:05:18Z) - PT-symmetric quantum Rabi model [2.8009256749748257]
We explore the PT-symmetric quantum Rabi model, which describes a PT-symmetric qubit coupled to a quantized light field.
Rich and exotic behaviors are observed in both strong and ultra-strong coupling regimes.
Our work extends the theory of PT symmetry into the full quantum light-matter interaction regime and provides insights that can be readily enlarged to a broad class of quantum optical systems.
arXiv Detail & Related papers (2022-12-13T14:00:51Z) - Sensing quantum chaos through the non-unitary geometric phase [62.997667081978825]
We propose a decoherent mechanism for sensing quantum chaos.
The chaotic nature of a many-body quantum system is sensed by studying the implications that the system produces in the long-time dynamics of a probe coupled to it.
arXiv Detail & Related papers (2021-04-13T17:24:08Z) - Chiral state conversion in a levitated micromechanical oscillator with
in situ control of parameter loops [13.570675757915422]
We propose an easy-controllable levitated microparticle system that carries a pair of exceptional points (EPs) and realize slow evolution of the Hamiltonian along loops in the parameter plane.
We demonstrate that, under the joint action of topological structure of energy surfaces and nonadiabatic transitions (NATs), the chiral behavior emerges both along a loop encircling an EP and even along a straight path away from the EP.
arXiv Detail & Related papers (2020-10-21T10:04:51Z) - Experimental simulation of the Parity-Time-symmetric dynamics using
photonics qubits [7.67529162088556]
We experimentally demonstrate the general dynamical evolution of a two-level system under the action of PT symmetric Hamiltonian.
Our work provides a route for further exploiting the exotic properties of PT symmetric Hamiltonian for quantum simulation and quantum information processing.
arXiv Detail & Related papers (2020-04-19T23:08:11Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.